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I have solder paste calculator for stencil release. This may help you.
Contact me off line and I will send to you.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gumpert, Ben
Sent: Tuesday, May 20, 2008 12:44 PM
To: [log in to unmask]
Subject: Re: [TN] Average paste volume estimate
An easy way is to make a bunch of assumptions...
2" x 2" board
5 mil stencil
10% of board area is pasted
Paste is 50% metal
SnPb solder = 137.7 g/in^3
In this case you would have .1377g of SnPb on a 2" square board (Which
ignores the fact that you asked for the amount of paste, not
solder)
This will only be close to accurate if you know some of the actual
values assumed above, stencil thickness and paste coverage area probably
having the highest impact.
Ben
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dan Mathews
Sent: Tuesday, May 20, 2008 12:10 PM
To: [log in to unmask]
Subject: [TN] Average paste volume estimate
Does anyone have an easy way to estimate how much paste is applied to a
smt pcb? I understand it varies on
squeegee pressure, stencil thickness, and pitch of the components but I
was looking for an average. I would
assume that somewhere out there someone can estimate that "2 grams of
paste is used on a 2" x 2" smt pcb".
I will then use this information to determine how much lead is used on
non-RoHS products due to solder paste
issues and not non-compliant components.
Thank You in Advance,
Dan
Dan Mathews C.I.D.+
Engineering Support Supervisor
B&B Electronics
Ottawa, IL USA 61350
Phone: 815-433-5100 ext 217
Fax: 815-434-8831 (direct to my desk)
URL: http://www.bb-elec.com <http://www.bb-elec.com/>
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visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for
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847-615-7100 ext.2815
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Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
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